CN107104354B - A kind of big tuning amount high-precision locks the control system and control method of laser frequency - Google Patents
A kind of big tuning amount high-precision locks the control system and control method of laser frequency Download PDFInfo
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- CN107104354B CN107104354B CN201710361224.9A CN201710361224A CN107104354B CN 107104354 B CN107104354 B CN 107104354B CN 201710361224 A CN201710361224 A CN 201710361224A CN 107104354 B CN107104354 B CN 107104354B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 230000035559 beat frequency Effects 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 230000033228 biological regulation Effects 0.000 claims description 9
- 230000010287 polarization Effects 0.000 claims description 9
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 230000010354 integration Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract 3
- 238000000960 laser cooling Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10053—Phase control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1109—Active mode locking
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
本发明公开了一种大调谐量高精度锁定激光频率的控制系统及控制方法。本发明采用主激光器和从激光器，合束获得拍频信号；调节从激光器的注入电流实现对从激光器的输出频率的控制，进而控制拍频信号的频率；采用CPLD将锁频和锁相两个控制环路结合起来，实现了同时大动态范围和高精度控制激光频率的目标；以主激光器的输出光频率为基准，精确锁定从激光器的输出光频率，实现了从激光器的输出光频率大调谐量和高精度控制。本发明能够实现快速、大调谐量(40GHz以上)和高精度(1Hz)的激光频率调谐和锁定；本发明的方法可以广泛应用在激光冷却、原子频标和原子干涉仪等基础研究和精密测量技术领域。
The invention discloses a control system and a control method for locking a laser frequency with a large tuning amount and high precision. The invention adopts the master laser and the slave laser to combine beams to obtain the beat frequency signal; adjust the injection current of the slave laser to realize the control of the output frequency of the slave laser, and then control the frequency of the beat frequency signal; adopt CPLD to combine the frequency locking and phase locking The control loop is combined to achieve the goal of controlling the laser frequency with large dynamic range and high precision at the same time; based on the output optical frequency of the master laser, the output optical frequency of the slave laser is accurately locked, and the output optical frequency of the slave laser is greatly tuned. volume and high precision control. The invention can realize fast, large tuning amount (above 40 GHz) and high precision (1 Hz) laser frequency tuning and locking; the method of the invention can be widely used in basic research and precision measurement such as laser cooling, atomic frequency standard and atomic interferometer. technical field.
Description
Technical field
The invention belongs to photoelectron technical fields, and in particular to a kind of big tuning amount high-precision locks the control of laser frequency
System and its control method.
Background technique
In laser accurate regulation atom, the relevant accurate measurement scene of laser, it usually needs adjust in very large range
Laser frequency, while needing to guarantee the high-precision of laser frequency.
For a laser, a wide range of tuning and high-precision locking of laser frequency are difficult to realize simultaneously.
In order to realize that a wide range of adjusting laser frequency, common method are to adjust laser external cavity length, die temperature or Injection Current,
But since the stability of exocoel is not high, the control precision of temperature and electric current is limited and the factors such as laser tube mode hopping, frequency control
Precision processed is low.In order to improve laser frequency control precision, common method be using acousto-optic modulation (generally in 50MHz) or
The modes such as the external modulations such as Electro-optical Modulation (generally in 100MHz) carry out shift frequency, or by laser frequency lock in super steady chamber or high Q
On the atomic transition spectral line of value, but the tuning range very little of these methods.
Summary of the invention
Current laser frequency control technology there are aiming at the problem that, the invention proposes a kind of big tuning amount high-precision controls
The control system and its control method of laser frequency；To the control of beat frequency rate, there are commonly two methods of frequency locking and locking phase, locks
The tuning of Larger Dynamic range may be implemented in frequency, but it is not high to control precision；Locking phase may be implemented high-precision Frequency Locking, but nothing
Method meets the tuning of Larger Dynamic range simultaneously.The present invention uses programmable logic device (CPLD) by two loop knots of frequency locking and locking phase
Altogether, it realizes while the target of Larger Dynamic range and high-precision control laser frequency.
An object of the present invention is to provide a kind of control systems of big tuning amount high-precision control laser frequency.
The control system of big tuning amount high-precision control laser frequency of the invention include: main laser, from laser, close
Bundle device, high-speed photodetector, frequency reference source, frequency locking device and phase-locking device；Wherein, main laser and from laser point
Not Shu Chu laser to beam merging apparatus；Beam merging apparatus output light to high-speed photodetector generates beat signal；Beat signal difference
It is transmitted to frequency locking device and phase-locking device；Frequency locking device includes frequency divider and programmable logic device (CPLD), by writing program
Frequency senser, locking phase control unit and main control unit are formed in CPLD；The divided device of beat signal is transformed into frequency as former letter
The frequency signal of number frequency 1/N, is transmitted to CPLD, and CPLD is surveyed using the reference signal that frequency reference source provides as clock reference
Frequency unit measures the frequency of beat signal, is transmitted to main control unit；Main control unit believes current beat signal frequency and beat frequency
Number frequency setting value compares, and obtains digital frequency locked signal, and digital frequency locked signal is fed back to the power supply from laser, is formed
Frequency-locked loop；Digital frequency locked Signal Regulation is from the Injection Current of laser, so that the output frequency from laser is adjusted, to adjust
The frequency of beat signal；Beat signal after adjusting frequency is further input to frequency locking device, when beat signal and beat signal
When the difference of frequency setting value is adjusted in the operating dynamic range of phase-locking device, main control unit keeps the digital frequency locked letter of output
It is number constant, pass through locking phase control unit and starts phase-locking device work；Phase-locking device includes sequentially connected integrated locking phase chip, low
Bandpass filter and proportional integral circuit；Integrated locking phase chip obtains the reference signal phase demodulation that beat signal is provided with frequency reference source
To corresponding error signal, the power supply from laser is fed back to after low-pass filter and proportional integral circuit are adjusted, is formed
Phase-locked loop；Error signal adjusts the Injection Current from laser, to realize the locking of laser frequency；Meanwhile CPLD is lasting
To beat signal frequency measurement, when the work that the frequency of beat signal is located at phase-locking device with the difference of beat signal frequency setting value is moved
When within the scope of state, keep the digital frequency locked signal of output constant；When the difference of beat signal and beat signal frequency setting value is super
When out in the operating dynamic range of phase-locking device, CPLD disconnects phase-locked loop, starts the digital frequency locked signal for updating output, passes through
The digital frequency locked Signal Regulation beat signal of output, until beat signal meets locking phase requirement again, eventually by phase-locked loop
It realizes and is locked from the output frequency of laser；Wherein, N is frequency dividing ratio, and N is natural number.
Beam merging apparatus uses 1/2 slide, polarization beam splitter prism and 1/4 slide；Wherein, main laser exports laser, through 1/2
Slide adjusts polarization direction, and the input polarization beam splitter prism together with the laser exported from laser, the laser after closing beam is through 1/4 glass
Piece is input to high-speed photodetector and forms beat signal.
High-speed photodetector uses indium gallium arsenic detector.
The output frequency of main laser is locked in exact value；It adjusts and realizes from the Injection Current of laser from the defeated of laser
Frequency is adjusted in a wide range of out, will be from the Frequency Locking of laser.The output for the slave laser that the control system can lock
The range of the difference of the output frequency of frequency and main laser is limited solely by the responsive bandwidth and frequency divider of high-speed photodetector
Bandwidth of operation.
It is another object of the present invention to provide a kind of control methods of big tuning amount high-precision control laser frequency.
The control method of big tuning amount high-precision control laser frequency of the invention, comprising the following steps:
1) main laser and laser is exported respectively from laser to beam merging apparatus；
2) beam merging apparatus output light to high-speed photodetector generates beat signal；
3) beat signal is transmitted separately to frequency locking device and phase-locking device；
4) the divided device of beat signal is transformed into the frequency signal that frequency is original signal frequency 1/N, is then transmit to CPLD,
For CPLD using the reference signal that frequency reference source provides as clock reference, frequency senser measures the frequency of beat signal, is transmitted to
Main control unit, wherein N is frequency dividing ratio, and N is natural number；
5) main control unit compares the frequency of beat signal with beat signal frequency setting value, if beat signal and bat
When the difference of frequency signal frequency setting value is beyond in the operating dynamic range of phase-locking device, enter step a), if beat signal
When being located in the operating dynamic range of phase-locking device with the difference of beat signal frequency setting value, enter step b):
A) main control unit stops phase-locking device work by control locking phase control unit, and main control unit updates digital frequency locked letter
Number, and digital frequency locked signal is fed back into the power supply from laser, form frequency-locked loop；Digital frequency locked Signal Regulation is from laser
Injection Current, to adjust from the output frequency of laser, to adjust the frequency of the beat signal after closing beam with main laser,
Then return step 1)；
B) main control unit keeps the digital frequency locked signal of output constant, starts phase-locking device work by locking phase control unit
Make；Beat signal is obtained corresponding error signal with the reference signal phase demodulation that frequency reference source provides by integrated locking phase chip, is passed through
The power supply from laser is fed back to after crossing low-pass filter and proportional integral circuit adjusting, forms phase-locked loop, error signal tune
Save the Injection Current from laser, return step 1), it realizes eventually by phase-locked loop from the output frequency of laser and locks.
Advantages of the present invention:
The present invention exports combiner and obtains beat signal using main laser and from laser；Adjust the note from laser
Enter control of the electric current realization to the output frequency from laser, and then controls the frequency of beat signal；Using CPLD by frequency locking and
Two control loops of locking phase combine, and realize while the target of Larger Dynamic range and high-precision control laser frequency；With master
On the basis of the output light frequency of laser, output light frequency of the accurate lock from laser, the frequency of two laser output lights
Difference can be adjusted in a big way, be thereby realized from the big tuning amount of output light frequency of laser and high-precision control.
The present invention solves the problems, such as that the big tuning amount of existing laser frequency control method and high-precision locking cannot be realized simultaneously, Neng Goushi
The laser frequency tuning and locking of now quick, big tuning amount (40GHz or more) and high-precision (1Hz)；Method of the invention can be with
It is widely used in basic research and the Technology of Precision Measurement fields such as cooling laser, atomic frequency standard and atomic interferometer.
Detailed description of the invention
Fig. 1 is the structural block diagram of the control system of big tuning amount high-precision control laser frequency of the invention.
Specific embodiment
With reference to the accompanying drawing, by specific embodiment, the present invention is further explained.
As shown in Figure 1, the control system of the big tuning amount high-precision locking laser frequency of the present embodiment includes: main laser
Device, from laser, beam merging apparatus, high-speed photodetector, frequency reference source, frequency locking device and phase-locking device；Wherein, conjunction is got one's things ready
It sets using 1/2 slide, polarization beam splitter prism and 1/4 slide；Main laser exports laser, adjusts polarization direction through 1/2 slide, with
Input polarization beam splitter prism, the laser after closing beam export the laser exported from laser through 1/4 slide together；Beam merging apparatus output
Light to high-speed photodetector generates beat signal；Beat signal is transmitted separately to frequency locking device and phase-locking device；Frequency locking device
Including frequency divider and programmable logic device (CPLD), frequency senser, locking phase control unit are formed in CPLD by writing program
And main control unit；The divided device of beat signal is transformed into the frequency signal that frequency is original signal frequency 1/N, is transmitted to CPLD,
For CPLD using the reference signal that frequency reference source provides as clock reference, frequency senser measures the frequency of beat signal, is transmitted to
Main control unit, main control unit compare current beat signal frequency with beat signal frequency setting value, obtain digital frequency locked
Signal, and digital frequency locked signal is fed back to the power supply from laser, forms frequency-locked loop, and digital frequency locked Signal Regulation is from laser
The Injection Current of device, so that the output frequency from laser is adjusted, to adjust the frequency of beat signal, the beat frequency after adjusting frequency
Signal is further input to frequency locking device, when the difference of beat signal and beat signal frequency setting value is adjusted to phase-locking device
When in operating dynamic range, main control unit keeps the digital frequency locked signal of output constant, passes through control locking phase control unit starting
Phase-locking device work；Phase-locking device includes sequentially connected integrated locking phase chip, low-pass filter and proportional integral circuit, is integrated
Beat signal is obtained corresponding error signal with the reference signal phase demodulation that frequency reference source provides by locking phase chip, by low pass filtered
Wave device and proportional integral circuit feed back to the power supply from laser after adjusting, and form phase-locked loop, and error signal is adjusted from laser
The Injection Current of device, to realize the locking of laser frequency；At this point, CPLD is persistently to beat signal frequency measurement, when beat signal frequency
When the difference of rate and beat signal frequency setting value is located in the operating dynamic range of phase-locking device, the digital frequency locked of output is kept
Signal is constant；When in operating dynamic range of the difference of beat signal and beat signal frequency setting value beyond phase-locking device,
CPLD disconnects phase-locked loop, starts the digital frequency locked signal for updating output, is believed by the digital frequency locked Signal Regulation beat frequency of output
Number frequency realizes the output frequency from laser eventually by phase-locked loop until beat signal frequency meets locking phase requirement again
Rate locking is equal to beat signal frequency setting value from the difference on the frequency of laser and main laser.
In the present embodiment, high-speed photodetector uses indium gallium arsenic detector；The frequency of main laser is
384234683MHz, is 384223114MHz from the frequency of laser, and the reference frequency that frequency reference source provides is 10MHz, lock
The operating dynamic range of phase device is 500MHz, and beat signal frequency setting value is 6580MHz.The present embodiment realizes ±
The big tuning amount of 20GHz, while the high-precision laser frequency tuning of 1Hz and locking.In the present embodiment, the frequency range be-
20GHz~20GHz, it is consistent with beat signal frequency range of set value.
It is finally noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but this field
Technical staff be understood that without departing from the spirit and scope of the invention and the appended claims, it is various replacement and repair
It is all possible for changing.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is to weigh
Subject to the range that sharp claim defines.
Claims (4)
1. a kind of control system of big tuning amount high-precision control laser frequency, which is characterized in that the control system includes: master
Laser, from laser, beam merging apparatus, high-speed photodetector, frequency reference source, frequency locking device and phase-locking device；Wherein, institute
It states main laser and exports laser respectively from laser to beam merging apparatus；The beam merging apparatus output light is to high-speed photodetector
Generate beat signal；Beat signal is transmitted separately to frequency locking device and phase-locking device；The frequency locking device includes frequency divider and can
Programmed logic device CPLD forms frequency senser, locking phase control unit and main control unit by writing program in CPLD；Beat frequency
The divided device of signal is transformed into the frequency signal that frequency is original signal frequency 1/N, is transmitted to CPLD, CPLD is mentioned with frequency reference source
For the reference signal of confession as clock reference, frequency senser measures the frequency of beat signal, is transmitted to main control unit；Main control unit will
Current beat signal frequency obtains digital frequency locked signal compared with beat signal frequency setting value, and by digital frequency locked letter
The power supply from laser number is fed back to, frequency-locked loop is formed；Digital frequency locked Signal Regulation is from the Injection Current of laser, to adjust
The output frequency from laser is saved, to adjust the frequency of beat signal；Beat signal after adjusting frequency is further input to lock
Frequency device, when the difference of beat signal and beat signal frequency setting value is adjusted in the operating dynamic range of phase-locking device,
Main control unit keeps the digital frequency locked signal of output constant, starts phase-locking device work by locking phase control unit；The locking phase
Device includes sequentially connected integrated locking phase chip, low-pass filter and proportional integral circuit；Integrated locking phase chip believes beat frequency
Number with frequency reference source provide reference signal phase demodulation obtain corresponding error signal, by low-pass filter and proportional integration electricity
Road feeds back to the power supply from laser after adjusting, form phase-locked loop；Error signal adjusts the Injection Current from laser, thus
Realize the locking of laser frequency；Meanwhile CPLD is persistently to beat signal frequency measurement, when the frequency and beat signal frequency of beat signal
When the difference of setting value is located in the operating dynamic range of phase-locking device, keep the digital frequency locked signal of output constant；Work as beat frequency
When the difference of signal and beat signal frequency setting value is beyond in the operating dynamic range of phase-locking device, CPLD disconnects phaselocked loop
Road starts the digital frequency locked signal for updating output, by the digital frequency locked Signal Regulation beat signal of output, until beat signal
Meet locking phase requirement again, realizes eventually by phase-locked loop from the output frequency of laser and lock；Wherein, N is frequency dividing ratio, N
For natural number.
2. control system as described in claim 1, which is characterized in that the beam merging apparatus uses 1/2 slide, polarization beam splitting rib
Mirror and 1/4 slide；Wherein, main laser exports laser, polarization direction is adjusted through 1/2 slide, with the laser exported from laser
Input polarization beam splitter prism together, the laser after closing beam are input to high-speed photodetector through 1/4 slide and form beat signal.
3. control system as described in claim 1, which is characterized in that the high-speed photodetector is detected using indium gallium arsenic
Device.
4. a kind of control method of the big tuning amount high-precision control laser frequency based on control system described in claim 1,
It is characterized in that, the control method the following steps are included:
1) main laser and laser is exported respectively from laser to beam merging apparatus；
2) beam merging apparatus output light to high-speed photodetector generates beat signal；
3) beat signal is transmitted separately to frequency locking device and phase-locking device；
4) the divided device of beat signal is transformed into the frequency signal that frequency is original signal frequency 1/N, is then transmit to CPLD, CPLD
For the reference signal provided using frequency reference source as clock reference, frequency senser measures the frequency of beat signal, is transmitted to master control
Unit, wherein N is frequency dividing ratio, and N is natural number；
5) main control unit compares the frequency of beat signal with beat signal frequency setting value, if beat signal and beat frequency are believed
It when the difference of number frequency setting value is beyond in the operating dynamic range of phase-locking device, enters step a), if beat signal and clapped
When the difference of frequency signal frequency setting value is located in the operating dynamic range of phase-locking device, enter step b):
A) main control unit stops phase-locking device work by control locking phase control unit, and main control unit updates digital frequency locked signal,
And digital frequency locked signal is fed back into the power supply from laser, form frequency-locked loop；Digital frequency locked Signal Regulation is from laser
Injection Current, to adjust the output frequency from laser, to adjust the frequency of the beat signal after closing beam with main laser, so
Return step 1 afterwards)；
B) main control unit keeps the digital frequency locked signal of output constant, starts phase-locking device work by locking phase control unit；Collection
Beat signal is obtained into corresponding error signal with the reference signal phase demodulation that frequency reference source provides at locking phase chip, by low pass
Filter and proportional integral circuit feed back to the power supply from laser after adjusting, and form phase-locked loop, and error signal is adjusted from sharp
The Injection Current of light device, return step 1), it realizes eventually by phase-locked loop from the output frequency of laser and locks.
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| GB2567470B (en) * | 2017-10-13 | 2022-03-09 | M Squared Lasers Ltd | A laser system comprising two phase-locked continuous-wave laser sources |
| CN109375229B (en) * | 2018-09-19 | 2023-01-06 | 北京遥感设备研究所 | Laser radar for remote high-speed target measurement |
| CN113594859B (en) * | 2020-04-30 | 2023-02-21 | 上海禾赛科技有限公司 | Injection locking correction method and device |
| CN112928590B (en) * | 2021-01-30 | 2022-03-22 | 杭州微伽量子科技有限公司 | Laser frequency locking method, system and light source |
| CN113078552B (en) * | 2021-03-15 | 2022-08-30 | 中国科学院上海光学精密机械研究所 | Frequency stabilizing device of single-frequency laser based on intracavity self-reference |
| GB2618050A (en) * | 2021-08-24 | 2023-11-01 | Element Six Tech Ltd | Raman laser system |
| CN115173210B (en) * | 2022-07-26 | 2024-11-01 | 天津大学 | Laser injection locking wavelength tracking controller and method based on current scanning |
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| GB2381121A (en) * | 2001-06-07 | 2003-04-23 | Univ London | Optical Frequency Synthesizer |
| US9190804B2 (en) * | 2012-08-07 | 2015-11-17 | Advantest Corporation | Pulse light source, and method for stably controlling phase difference between pulse laser lights |
| US9088369B2 (en) * | 2012-12-28 | 2015-07-21 | Synergy Microwave Corporation | Self injection locked phase locked looped optoelectronic oscillator |
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